The dock doesn't scratch the screen, as it's of a weaker material than the Switch screen, it's the dust that accumulates in the dock. To prevent that, the best method would be using a glass protector, it's much more prone to shattering than the original Switch Screen BUT it is impossible for dust or sand to scratch it as it's much harder on the scale...
That's also the reason why you won't easily scratch your gorilla-glass Smartphones but they shatter instantly when they hit a hard surface. Mineral-Glass would be the much better choice but no one uses it besides watch makers and even they don't really like it as it isn't as scratch proof as saphire glass(that in return is prone to shattering)...
That's also the reason why you won't easily scratch your gorilla-glass Smartphones but they shatter instantly when they hit a hard surface. Mineral-Glass would be the much better choice but no one uses it besides watch makers and even they don't really like it as it isn't as scratch proof as saphire glass(that in return is prone to shattering)...